Study On The Interaction Of The Deep Foundation And Adjacent Light Rail Viaduct Foundation

More excavations are carried out close to existing light rail due to recent city developments. This paper relies on the Laopupian deep excavation which is adjacent to the light rail, considering supporting structure, viaduct Foundationan and soil as a whole. Midas/GTS was employed to establish a numerical model to simulate the deformation law of foundation and its surrounding environment in the process of deep excavation.In the process of excavation, the horizontal displacement of diaphragm walls gradually increases and the maximum position decreases. The horizontal displacement of diaphragm walls is parabolic.Surrounding ground settlement are increased with excavation. There is basically no change in the maximum position. The soil properties is important to the settlement of soil around. Supporting structure have better performance on suppression of ground settlement. The maximum position is determined by the ground overload. Supporting structure greatly limit the movement of the maximum position in the direction of deep foundation.The deformation of pile caps and superstructure is small due to viaduct foundation. It has been proved by simulation that the influence of deep Excavation on adjacent light rail meet requirements. Viaduct piles played a beneficial role in controlling the ground settlement around the bridge piles. But the viaduct piles is so near to deep foundation that the horizontal displacement of diaphragm walls and surrounding ground settlement increase.The paper reveals the interaction mechanism of the deep foundation and adjacent light rail viaduct foundation, which can provide reference for practical project.